Rain, rain, it just won't stay away from southern Ontario!

Southern Ontario just can't seem to shake off its rainy and chilly pattern as we close out the month.

Take in the sunshine and seasonal temperatures while they last, southern Ontario, because the dreary rain and chilly temperatures are going to make another unwelcome appearance by the midweek.

If you've been putting off cutting the grass, now is the time to do so before the rain once again falls over southern Ontario on Wednesday as a low-pressure system moves over the Great Lakes.

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Scattered showers will prevail throughout the day on Wednesday, but it won't be until the evening hours that the rain becomes heavier and more persistent, especially in the southwest portions of the province, where we could see up to 20 mm. On a wider scale, we're looking at 5-20 mm of rainfall.

Southern Ontario Wednesday evening forecast rainfall - May 26, 2025

Temperatures will also dip back to below seasonal levels on Wednesday, feeling more like mid-spring than early summer.

The rain will lift north of the Greater Toronto Area and into eastern Ontario by Thursday morning, but the chilly air will continue to dominate for the rest of the week.

If you want warm weather in Ontario, you'll have to head up north, as temperatures across northern Ontario are forecast to stay in the low 20s.

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Ontario forecast temperatures and conditions Wednesday - May 26, 2025

Rainiest May since 2019?

May in southern Ontario has been anything but dry, which is good news for lawn enthusiasts and those looking to sit around the fire pit.

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In fact, Toronto Pearson Airport has only recorded six days of mostly sunny conditions so far this month (as of May 26), being defined as any day with four hours or less of cloud cover.

Toronto observed temperatures in May - May 26, 2025

Additionally, so far this month, Pearson has recorded 70.4 mm of rainfall--coming close to the average 77.5 mm the airport usually records. However, this rainy end to the month could be the final push to make it the rainiest May since 2019, when 97.6 mm was recorded.

Be on the lookout for ponding on roadways, though, as the ground has become thoroughly saturated from all the recent rain. Hopefully we don't see another repeat of last year when Toronto was struck by back-to-back flood events due to an unusually rainy season.

Stay with The Weather Network for more information and updates on your weather across Ontario.